US20070115403A1 - Backlight module and liquid crystal display - Google Patents
Backlight module and liquid crystal display Download PDFInfo
- Publication number
- US20070115403A1 US20070115403A1 US11/164,542 US16454205A US2007115403A1 US 20070115403 A1 US20070115403 A1 US 20070115403A1 US 16454205 A US16454205 A US 16454205A US 2007115403 A1 US2007115403 A1 US 2007115403A1
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- Prior art keywords
- light
- adhesive tape
- disposed
- reflective
- backlight module
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Definitions
- the present invention generally relates to a backlight module and a liquid crystal display, in particular, to a backlight module adapted for providing uniform surface light source and a liquid crystal display utilizing the backlight module.
- the flat panel display fabricated by the optoelectronic technology and semiconductor process such as the liquid crystal display (LCD), the organic electroluminescent device (OLED) or the plasma display panel (PDP) has become the mainstream of the display device.
- LCD liquid crystal display
- OLED organic electroluminescent device
- PDP plasma display panel
- Most of the cell phone, the digital camera, the digital video camera, the notebook and the desk-top computer utilize the LCD panel as the display screen.
- the LCD panel doesn't emit light itself so a backlight module is arranged below the LCD panel, to provide the surface light source for the LCD panel. Then, the LCD panel can display image.
- FIG. 1 is a three-dimensional view showing a conventional backlight module.
- the backlight module 100 comprises a frame 110 , a fixing adhesive tape 12 , a reflective plate 130 , a light-guiding plate 140 and a light source 150 .
- the fixing adhesive tape 120 is disposed in one side 112 of the frame 110 .
- the reflective plate 130 is disposed in the frame 110 .
- the light-guiding plate 140 having a light incident surface 142 is disposed in the frame 110 , and on the reflective plate 130 and the fixing adhesive tape 120 .
- the light source 150 is disposed beside the light incident surface 142 of the light-guiding plate 140 .
- optical films such as a collecting sheet 160 and a diffusion sheet 170 can be sequentially stacked on the light-guiding plate 140 .
- a prism type light-guiding plate 140 is adapted for enhancing the brightness of the backlight module 100 , as shown in the enlarged part of FIG. 1 .
- fasteners such as locating protrusions or pared corners may damage the structure of the prism type light-guiding plate 140 , therefore, they are not suitable for locating the prism type light-guiding plate 140 in the frame 110 .
- the prism type light-guiding plate 140 is generally fixed in the frame 110 by the fixing adhesive tape 120 .
- a gap d 1 (as shown in FIG. 2 ) may be formed between the fixing adhesive tape 120 and the reflective plate 130 .
- FIG. 2 is a schematic cross-sectional view showing a liquid crystal display which the backlight module shown in FIG. 1 is applied to; the cross-sectional view is drawn along line A-A′.
- the liquid crystal display 300 comprises the backlight module 100 and a liquid crystal display panel 200 .
- the backlight module 100 is adapted for providing the liquid crystal display panel 200 with a surface light source in order to display. Because the gap d 1 is formed between the fixing adhesive tape 120 and the reflective plate 130 , the intensity of the light 190 reflected from the frame 110 within the gap d 1 is different from that of the light 192 reflected by the reflective plate 130 . Accordingly, the backlight module 100 would not be able to provide uniform light source, and a region 202 having non-uniform light intensity is formed in the liquid crystal display panel 180 and is corresponding to the gap d 1 .
- the present invention is directed to a backlight module suitable for providing a uniform surface light source.
- the present invention is also directed to a liquid crystal display, which utilizes the uniform surface light source provided by the above-mentioned backlight module, for improving the display quality thereof.
- the present invention provides a backlight module comprising a frame, a reflective adhesive tape, a fixing adhesive tape, a reflective plate, a light-guiding plate and at least one light source.
- the frame has a groove at one side.
- the reflective adhesive tape is disposed in the groove.
- the fixing adhesive tape is disposed at the side of the frame and on the reflective adhesive tape.
- the reflective plate is disposed in the frame, wherein a gap is formed between the reflective plate and the fixing adhesive tape, and the gap is above the reflective adhesive tape.
- the light-guiding plate is disposed in the frame and on the reflective plate and the fixing adhesive tape, and the light-guiding plate has at least one light-incident surface.
- the light source is disposed beside the light-incident surface of the light-guiding plate.
- the present invention also provides a liquid crystal display comprising a backlight module and a liquid crystal display panel.
- the backlight module comprises a frame, a reflective adhesive tape, a fixing adhesive tape, a reflective plate, a light-guiding plate and at least one light source.
- the frame has a groove at one side.
- the reflective adhesive tape is disposed in the groove.
- the fixing adhesive tape is disposed at the side of the frame and on the reflective adhesive tape.
- the reflective plate is disposed in the frame, wherein a gap is formed between the reflective plate and the fixing adhesive tape, and the gap is above the reflective adhesive tape.
- the light-guiding plate is disposed in the frame and on the reflective plate and the fixing adhesive tape, and the light-guiding plate has at least one light-incident surface.
- the light source is disposed beside the light-incident surface of the light-guiding plate.
- the liquid crystal display panel is disposed on the backlight module.
- the reflection coefficient of the reflective adhesive tape is the same as that of the reflective plate.
- a material of the reflective adhesive tape is selected from the group consisting of silver, aluminum and a combination thereof.
- a material of the reflective plate is selected from the group consisting of silver, aluminum and a combination thereof.
- the light-guiding plate is a prism type light-guiding plate.
- the backlight module further comprises a set of optical films disposed in the frame and above the light-guiding plate.
- the set of optical films comprises a collecting sheet and a diffusion sheet for example.
- the collecting sheet is disposed on the light-guiding plate, and the diffusion sheet is disposed on the collecting sheet.
- the collecting sheet comprises a prism type collecting sheet.
- the light source comprises a cold cathode fluorescent lamp or light emitting diode array.
- the liquid crystal display panel comprises a thin film transistor array substrate, a color filter substrate and a liquid crystal layer.
- the liquid crystal layer is disposed between the thin film transistor array substrate and the color filter substrate.
- the backlight module of the present invention utilizes a groove formed at one side of the frame for placing the reflective adhesive tape.
- the light incident into the gap would be reflected by the reflective adhesive tape rather than the frame.
- the intensity of light reflected by the reflective adhesive tape is almost the same as that of the light reflected by the reflective plate. Therefore, the backlight module can provide a uniform surface light source, and the liquid crystal display, which the backlight module is applied to, would have better display quality.
- FIG. 1 is a three-dimensional view showing a conventional backlight module.
- FIG. 2 is a schematic cross-sectional view showing a liquid crystal display, which the backlight module shown in FIG. 1 is applied to.
- FIG. 3 is a top view showing liquid crystal display shown in FIG. 2 .
- FIG. 4 is a three-dimensional view showing a backlight module according to a preferred embodiment of the present invention.
- FIG. 4A is a schematic cross-sectional view showing the backlight module shown in FIG. 4 along line B-B′.
- FIG. 5 is a schematic cross-sectional view showing a liquid crystal display along line B-B′ shown in FIG. 4A .
- FIG. 4 is a three-dimensional view showing a backlight module according to a preferred embodiment of the present invention.
- FIG. 4A is a schematic cross-sectional view showing the backlight module shown in FIG. 4 along line B-B′.
- the backlight module 400 comprises a frame 410 , a reflective adhesive tape 420 , a fixing adhesive tape 430 , a reflective plate 440 , a light-guiding plate 450 and at least one light source 460 .
- the frame 410 has a groove 414 at one side 412 .
- the reflective adhesive tape 420 is disposed in the groove 414 .
- the fixing adhesive tape 430 is disposed at the side 412 of the frame 410 and on the reflective adhesive tape 420 .
- the reflective plate 440 is disposed in the frame 410 , wherein a gap d 2 is formed between the reflective plate 440 and the fixing adhesive tape 430 , and the gap d 2 is above the reflective adhesive tape 420 .
- the light-guiding plate 450 is disposed in the frame 410 and on the reflective plate 440 and the fixing adhesive tape 430 , and the light-guiding plate 450 has at least one light-incident surface 452 a .
- the light source 460 is disposed beside the light-incident surface 452 a of the light-guiding plate 450 .
- the light-guiding plate 450 can be a prism type light-guiding plate. Accordingly, the light-guiding plate 450 utilizes the principle of prism to make light traveling in the light-guiding plate 450 form a surface light source, to improve the luminance thereof. Particularly, light can be incident into the light-guiding plate 450 not only through the light incident surface 452 a , but also through other surfaces as the light incident surfaces 452 b , 452 c and 452 d . Therefore, a plurality of light sources 460 (only one light source 460 is shown in FIG. 4 ) can be disposed beside the light incident surfaces 452 b , 452 c and 452 d respectively, to improve the brightness of surface light source. In one embodiment of the present invention, the light source 460 can be a cold cathode fluorescent lamp (CCFL) or light emitting diode array (LED array).
- CCFL cold cathode fluorescent lamp
- LED array light emitting diode array
- the backlight module 400 further comprises a set of optical films 470 disposed in the frame 410 and above the light-guiding plate 450 .
- the set of optical films 470 a collecting sheet 472 and a diffusion sheet 474 .
- the collecting sheet 472 is disposed on the light-guiding plate 450
- the diffusion sheet 474 is disposed on the collecting sheet 472 .
- the collecting sheet 472 can be a prism type collecting sheet.
- the prism type collecting sheet utilizes the principle of prism to collect scattering light to a predetermined range of angle, to enhance the utilization of light. After that, light travels through the diffusion sheet 474 , which makes light scatter uniformly, to form a uniform surface light source.
- a groove 414 is previously formed below the gap d 2 , which is located between the fixing adhesive tape 430 and the reflective plate 440 , in the frame 410 . Then, the reflective adhesive tape 420 is disposed in the groove 414 . Thus, the light emitted from the gap d 2 is reflected by the reflective adhesive tape 420 .
- the reflection coefficient of the reflective adhesive tape 420 is the same as that of the reflective plate 440 .
- the material of the reflective adhesive tape 420 is selected from the group consisting of silver, aluminum and a combination thereof, and material of the reflective plate 440 is selected from the group consisting of silver, aluminum and a combination thereof. It means that the brightness of the light 492 reflected by the reflective adhesive tape 420 is similar to that of the light 494 reflected by the reflective plate 440 . Therefore, the problem of non-uniform brightness due to the gap in the prior art can be resolved by using the backlight module 400 of the present invention.
- the backlight module 400 can provide a uniform surface light source.
- the backlight module 400 of the present invention can be applied to a LCD for getting better display quality.
- FIG. 5 is a schematic cross-sectional view showing a liquid crystal display along line B-B′ shown in FIG. 4A .
- the LCD 600 comprises a backlight module 400 as shown in FIGS. 4 and 4 A, and a liquid crystal display panel 500 .
- the structure of the backlight module 400 is described in the above, so it is not repeated herein.
- the liquid crystal display panel 500 is arranged on the backlight module 400 , and it comprises a thin film transistor array substrate 510 , a color filter substrate 520 and a liquid crystal layer 530 .
- the liquid crystal layer 530 is disposed between the thin film transistor array substrate 510 and the color filter substrate 520 .
- the liquid crystal display panel 500 displays images by using the surface light source provided by the backlight module 400 .
- the frame 410 has a groove 414 disposed at one side 412 , and the reflective adhesive tape 420 is disposed in the groove 414 . Accordingly, even if a gap d 2 is formed between the fixing adhesive tape 430 and the reflective plate 440 , the light 492 emitted from the gap d 2 is reflected by the reflective adhesive tape 420 .
- the brightness of the light 492 reflected by the reflective adhesive tape 420 is similar to that of the light 494 reflected by the reflective plate 440 .
- the backlight module 400 can provide a more uniform surface light source, to further improve the display quality of the LCD 600 .
- the backlight module and the LCD of the present invention have the following advantages:
- the frame has a groove disposed at one side, and the reflective adhesive tape is disposed in the groove. Accordingly, even if a gap is formed between the fixing adhesive tape and the reflective plate, the light emitted from the gap is reflected by the reflective adhesive tape.
- the brightness of the light reflected by the reflective adhesive tape is similar to that of the light reflected by the reflective plate.
- the backlight module can provide a more uniform surface light source, and the LCD utilizing the backlight module has better display quality.
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- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
Description
- 1. Field of the Invention
- The present invention generally relates to a backlight module and a liquid crystal display, in particular, to a backlight module adapted for providing uniform surface light source and a liquid crystal display utilizing the backlight module.
- 2. Description of Related Art
- With recent advancement in modern video technology, the tendency of the video device is towards light weight, big size and thin panel. The flat panel display fabricated by the optoelectronic technology and semiconductor process such as the liquid crystal display (LCD), the organic electroluminescent device (OLED) or the plasma display panel (PDP) has become the mainstream of the display device. Most of the cell phone, the digital camera, the digital video camera, the notebook and the desk-top computer utilize the LCD panel as the display screen. The LCD panel doesn't emit light itself so a backlight module is arranged below the LCD panel, to provide the surface light source for the LCD panel. Then, the LCD panel can display image.
-
FIG. 1 is a three-dimensional view showing a conventional backlight module. As shown inFIG. 1 , thebacklight module 100 comprises aframe 110, a fixing adhesive tape 12, areflective plate 130, a light-guidingplate 140 and alight source 150. The fixingadhesive tape 120 is disposed in oneside 112 of theframe 110. Thereflective plate 130 is disposed in theframe 110. The light-guidingplate 140 having alight incident surface 142 is disposed in theframe 110, and on thereflective plate 130 and the fixingadhesive tape 120. Thelight source 150 is disposed beside thelight incident surface 142 of the light-guidingplate 140. Besides, as shown inFIG. 1 , optical films such as acollecting sheet 160 and adiffusion sheet 170 can be sequentially stacked on the light-guidingplate 140. - It should be noted that a prism type light-guiding
plate 140 is adapted for enhancing the brightness of thebacklight module 100, as shown in the enlarged part ofFIG. 1 . Because fasteners such as locating protrusions or pared corners may damage the structure of the prism type light-guidingplate 140, therefore, they are not suitable for locating the prism type light-guidingplate 140 in theframe 110. According, the prism type light-guidingplate 140 is generally fixed in theframe 110 by the fixingadhesive tape 120. However, when the prism type light-guidingplate 120 is fixed by using the fixingadhesive tape 120, a gap d1 (as shown inFIG. 2 ) may be formed between the fixingadhesive tape 120 and thereflective plate 130. -
FIG. 2 is a schematic cross-sectional view showing a liquid crystal display which the backlight module shown inFIG. 1 is applied to; the cross-sectional view is drawn along line A-A′. Please refer toFIG. 2 , theliquid crystal display 300 comprises thebacklight module 100 and a liquidcrystal display panel 200. Thebacklight module 100 is adapted for providing the liquidcrystal display panel 200 with a surface light source in order to display. Because the gap d1 is formed between the fixingadhesive tape 120 and thereflective plate 130, the intensity of thelight 190 reflected from theframe 110 within the gap d1 is different from that of thelight 192 reflected by thereflective plate 130. Accordingly, thebacklight module 100 would not be able to provide uniform light source, and aregion 202 having non-uniform light intensity is formed in the liquid crystal display panel 180 and is corresponding to the gap d1. - Accordingly, the present invention is directed to a backlight module suitable for providing a uniform surface light source.
- The present invention is also directed to a liquid crystal display, which utilizes the uniform surface light source provided by the above-mentioned backlight module, for improving the display quality thereof.
- As embodied and broadly described herein, the present invention provides a backlight module comprising a frame, a reflective adhesive tape, a fixing adhesive tape, a reflective plate, a light-guiding plate and at least one light source. The frame has a groove at one side. The reflective adhesive tape is disposed in the groove. The fixing adhesive tape is disposed at the side of the frame and on the reflective adhesive tape. The reflective plate is disposed in the frame, wherein a gap is formed between the reflective plate and the fixing adhesive tape, and the gap is above the reflective adhesive tape. The light-guiding plate is disposed in the frame and on the reflective plate and the fixing adhesive tape, and the light-guiding plate has at least one light-incident surface. The light source is disposed beside the light-incident surface of the light-guiding plate.
- As embodied and broadly described herein, the present invention also provides a liquid crystal display comprising a backlight module and a liquid crystal display panel. The backlight module comprises a frame, a reflective adhesive tape, a fixing adhesive tape, a reflective plate, a light-guiding plate and at least one light source. The frame has a groove at one side. The reflective adhesive tape is disposed in the groove. The fixing adhesive tape is disposed at the side of the frame and on the reflective adhesive tape. The reflective plate is disposed in the frame, wherein a gap is formed between the reflective plate and the fixing adhesive tape, and the gap is above the reflective adhesive tape. The light-guiding plate is disposed in the frame and on the reflective plate and the fixing adhesive tape, and the light-guiding plate has at least one light-incident surface. The light source is disposed beside the light-incident surface of the light-guiding plate. The liquid crystal display panel is disposed on the backlight module.
- According to an embodiment of the present invention, the reflection coefficient of the reflective adhesive tape is the same as that of the reflective plate.
- According to an embodiment of the present invention, a material of the reflective adhesive tape is selected from the group consisting of silver, aluminum and a combination thereof.
- According to an embodiment of the present invention, a material of the reflective plate is selected from the group consisting of silver, aluminum and a combination thereof.
- According to an embodiment of the present invention, the light-guiding plate is a prism type light-guiding plate.
- According to an embodiment of the present invention, the backlight module further comprises a set of optical films disposed in the frame and above the light-guiding plate. The set of optical films comprises a collecting sheet and a diffusion sheet for example. The collecting sheet is disposed on the light-guiding plate, and the diffusion sheet is disposed on the collecting sheet. Besides, the collecting sheet comprises a prism type collecting sheet.
- According to an embodiment of the present invention, the light source comprises a cold cathode fluorescent lamp or light emitting diode array.
- According to an embodiment of the present invention, the liquid crystal display panel comprises a thin film transistor array substrate, a color filter substrate and a liquid crystal layer. The liquid crystal layer is disposed between the thin film transistor array substrate and the color filter substrate.
- The backlight module of the present invention utilizes a groove formed at one side of the frame for placing the reflective adhesive tape. The light incident into the gap would be reflected by the reflective adhesive tape rather than the frame. The intensity of light reflected by the reflective adhesive tape is almost the same as that of the light reflected by the reflective plate. Therefore, the backlight module can provide a uniform surface light source, and the liquid crystal display, which the backlight module is applied to, would have better display quality.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
-
FIG. 1 is a three-dimensional view showing a conventional backlight module. -
FIG. 2 is a schematic cross-sectional view showing a liquid crystal display, which the backlight module shown inFIG. 1 is applied to. -
FIG. 3 is a top view showing liquid crystal display shown inFIG. 2 . -
FIG. 4 is a three-dimensional view showing a backlight module according to a preferred embodiment of the present invention. -
FIG. 4A is a schematic cross-sectional view showing the backlight module shown inFIG. 4 along line B-B′. -
FIG. 5 is a schematic cross-sectional view showing a liquid crystal display along line B-B′ shown inFIG. 4A . - Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
-
FIG. 4 is a three-dimensional view showing a backlight module according to a preferred embodiment of the present invention.FIG. 4A is a schematic cross-sectional view showing the backlight module shown inFIG. 4 along line B-B′. Please refer toFIGS. 4 and 4 A, thebacklight module 400 comprises aframe 410, a reflectiveadhesive tape 420, a fixingadhesive tape 430, areflective plate 440, a light-guidingplate 450 and at least onelight source 460. Theframe 410 has agroove 414 at oneside 412. The reflectiveadhesive tape 420 is disposed in thegroove 414. The fixingadhesive tape 430 is disposed at theside 412 of theframe 410 and on the reflectiveadhesive tape 420. Thereflective plate 440 is disposed in theframe 410, wherein a gap d2 is formed between thereflective plate 440 and the fixingadhesive tape 430, and the gap d2 is above the reflectiveadhesive tape 420. The light-guidingplate 450 is disposed in theframe 410 and on thereflective plate 440 and the fixingadhesive tape 430, and the light-guidingplate 450 has at least one light-incident surface 452 a. Thelight source 460 is disposed beside the light-incident surface 452 a of the light-guidingplate 450. - Please refer to the enlarged view shown in
FIG. 4 , the light-guidingplate 450 can be a prism type light-guiding plate. Accordingly, the light-guidingplate 450 utilizes the principle of prism to make light traveling in the light-guidingplate 450 form a surface light source, to improve the luminance thereof. Particularly, light can be incident into the light-guidingplate 450 not only through thelight incident surface 452 a, but also through other surfaces as the light incident surfaces 452 b, 452 c and 452 d. Therefore, a plurality of light sources 460 (only onelight source 460 is shown inFIG. 4 ) can be disposed beside the light incident surfaces 452 b, 452 c and 452 d respectively, to improve the brightness of surface light source. In one embodiment of the present invention, thelight source 460 can be a cold cathode fluorescent lamp (CCFL) or light emitting diode array (LED array). - Besides, as shown in
FIGS. 4 and 4 A, in one embodiment of the present invention, thebacklight module 400 further comprises a set ofoptical films 470 disposed in theframe 410 and above the light-guidingplate 450. The set of optical films 470 a collectingsheet 472 and adiffusion sheet 474. The collectingsheet 472 is disposed on the light-guidingplate 450, and thediffusion sheet 474 is disposed on the collectingsheet 472. As shown inFIG. 4A , the collectingsheet 472 can be a prism type collecting sheet. The prism type collecting sheet utilizes the principle of prism to collect scattering light to a predetermined range of angle, to enhance the utilization of light. After that, light travels through thediffusion sheet 474, which makes light scatter uniformly, to form a uniform surface light source. - It should be noted that a
groove 414 is previously formed below the gap d2, which is located between the fixingadhesive tape 430 and thereflective plate 440, in theframe 410. Then, the reflectiveadhesive tape 420 is disposed in thegroove 414. Thus, the light emitted from the gap d2 is reflected by the reflectiveadhesive tape 420. - Particularly, in one embodiment of the present invention, the reflection coefficient of the reflective
adhesive tape 420 is the same as that of thereflective plate 440. The material of the reflectiveadhesive tape 420 is selected from the group consisting of silver, aluminum and a combination thereof, and material of thereflective plate 440 is selected from the group consisting of silver, aluminum and a combination thereof. It means that the brightness of the light 492 reflected by the reflectiveadhesive tape 420 is similar to that of the light 494 reflected by thereflective plate 440. Therefore, the problem of non-uniform brightness due to the gap in the prior art can be resolved by using thebacklight module 400 of the present invention. - In summary, even if a gap d2 is formed between the fixing
adhesive tape 430 and thereflective plate 440, the light 492 emitted from the gap d2 is reflected by the reflectiveadhesive tape 420. The brightness of the light 492 reflected by the reflectiveadhesive tape 420 is similar to that of the light 494 reflected by thereflective plate 440. Therefore, the problem of non-uniform brightness due to the gap in the prior art can be resolved by using thebacklight module 400 of the present invention. Thebacklight module 400 can provide a uniform surface light source. Thus, thebacklight module 400 of the present invention can be applied to a LCD for getting better display quality. -
FIG. 5 is a schematic cross-sectional view showing a liquid crystal display along line B-B′ shown inFIG. 4A . TheLCD 600 comprises abacklight module 400 as shown inFIGS. 4 and 4 A, and a liquidcrystal display panel 500. The structure of thebacklight module 400 is described in the above, so it is not repeated herein. The liquidcrystal display panel 500 is arranged on thebacklight module 400, and it comprises a thin filmtransistor array substrate 510, acolor filter substrate 520 and aliquid crystal layer 530. Theliquid crystal layer 530 is disposed between the thin filmtransistor array substrate 510 and thecolor filter substrate 520. The liquidcrystal display panel 500 displays images by using the surface light source provided by thebacklight module 400. - Note that the
frame 410 has agroove 414 disposed at oneside 412, and the reflectiveadhesive tape 420 is disposed in thegroove 414. Accordingly, even if a gap d2 is formed between the fixingadhesive tape 430 and thereflective plate 440, the light 492 emitted from the gap d2 is reflected by the reflectiveadhesive tape 420. The brightness of the light 492 reflected by the reflectiveadhesive tape 420 is similar to that of the light 494 reflected by thereflective plate 440. Thus, thebacklight module 400 can provide a more uniform surface light source, to further improve the display quality of theLCD 600. - In summary, the backlight module and the LCD of the present invention have the following advantages:
- In the present invention, the frame has a groove disposed at one side, and the reflective adhesive tape is disposed in the groove. Accordingly, even if a gap is formed between the fixing adhesive tape and the reflective plate, the light emitted from the gap is reflected by the reflective adhesive tape. The brightness of the light reflected by the reflective adhesive tape is similar to that of the light reflected by the reflective plate. Thus, the backlight module can provide a more uniform surface light source, and the LCD utilizing the backlight module has better display quality.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Claims (19)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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TW094141089A TWI282473B (en) | 2005-11-23 | 2005-11-23 | Backlight module and liquid crystal display |
TW94141089 | 2005-11-23 |
Publications (2)
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US20070115403A1 true US20070115403A1 (en) | 2007-05-24 |
US7471354B2 US7471354B2 (en) | 2008-12-30 |
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US11/164,542 Active 2026-07-20 US7471354B2 (en) | 2005-11-23 | 2005-11-29 | Backlight module and liquid crystal display |
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US (1) | US7471354B2 (en) |
TW (1) | TWI282473B (en) |
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US7471354B2 (en) * | 2005-11-23 | 2008-12-30 | Chunghwa Picture Tubes, Ltd. | Backlight module and liquid crystal display |
US20130077347A1 (en) * | 2011-09-28 | 2013-03-28 | Jia-Lang Hsu | Display module |
US20180067252A1 (en) * | 2016-09-08 | 2018-03-08 | Minebea Mitsumi Inc. | Planar illumination device |
CN108594530A (en) * | 2018-05-02 | 2018-09-28 | 佛山博发智能科技有限公司 | A kind of energy-saving display panel of light shading type for TPC machines |
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TWI402574B (en) * | 2009-09-25 | 2013-07-21 | Chunghwa Picture Tubes Ltd | Back light module |
TWI418896B (en) * | 2010-04-01 | 2013-12-11 | Au Optronics Corp | Backlight module and liquid crystal display module |
EP3346324B1 (en) * | 2015-09-01 | 2020-06-03 | Panasonic Intellectual Property Management Co., Ltd. | Video display device |
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Also Published As
Publication number | Publication date |
---|---|
US7471354B2 (en) | 2008-12-30 |
TWI282473B (en) | 2007-06-11 |
TW200720775A (en) | 2007-06-01 |
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